کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6631060 | 1424939 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Viscosity of a [xCH4â¯+â¯(1â¯ââ¯x)C3H8] mixture with xâ¯=â¯0.8888 at temperatures between (203 and 424)â¯K and pressures between (2 and 31)â¯MPa
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Viscosity of a [xCH4â¯+â¯(1â¯ââ¯x)C3H8] mixture with xâ¯=â¯0.8888 at temperatures between (203 and 424)â¯K and pressures between (2 and 31)â¯MPa Viscosity of a [xCH4â¯+â¯(1â¯ââ¯x)C3H8] mixture with xâ¯=â¯0.8888 at temperatures between (203 and 424)â¯K and pressures between (2 and 31)â¯MPa](/preview/png/6631060.png)
چکیده انگلیسی
Viscosity measurements of [xCH4â¯+â¯(1â¯ââ¯x)C3H8] with xâ¯=â¯0.8888 are reported for temperatures between (203 and 424)â¯K and pressures between (2 and 31)â¯MPa using a vibrating wire viscometer clamped at both ends and operating in a steady-state mode. Reliable operation over this range of conditions required a detailed set of calibration and validation measurements using pure reference fluids. Most previous viscosity determinations with vibrating wire instruments have determined the important vacuum damping parameter Î0 from a single measurement and assumed it was temperature independent. Here we extended the calibration procedure beyond measurements in vacuum and helium (to determine the wire radius) to include low density methane (Ïâ¯â¤â¯1.2â¯kg·mâ3) from (223 to 420)â¯K. Using viscosity values for these reference fluids linked to ab initio calculations revealed Î0 had a temperature dependence below about 350â¯K, increasing from 2.04â¯Ãâ¯10â5 at 372â¯K to 5.79â¯Ãâ¯10â5 at 223â¯K. Subsequent validation measurements with pure N2, He and CH4 at pressures to 30â¯MPa confirmed the estimated standard relative uncertainty in viscosity of less 2.5%. The binary mixture measurements were compared with literature data and the predictions of four models including two corresponding states based approaches (ECS and ST), a semi-theoretical model (VW) based on an extended hard-sphere scheme derived from the Enskog equation, and a model (LJ) based on molecular dynamics simulations of Lennard Jones fluids. The ECS and ST models exhibited systematic relative deviations from the data of up to â5% at 150â¯kg·mâ3 and -10% at 300â¯kg·mâ3, respectively. The LJ and VW models provided far better (<4%) representations of the data over their entire range, with the VW model able to represent all the measurements within 3%, which is comparable to their experimental uncertainty.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fuel - Volume 225, 1 August 2018, Pages 563-572
Journal: Fuel - Volume 225, 1 August 2018, Pages 563-572
نویسندگان
Fernando F. Czubinski, Saif Z.S. Al Ghafri, Thomas J. Hughes, Paul L. Stanwix, Eric F. May,